NOSQL High Scalability

Choosing your next NoSQL database

http://highscalability.com/blog/2013/6/10/the-10-deadly-sins-against-scalability.html

http://blog.nahurst.com/visual-guide-to-nosql-systems

http://highscalability.com/blog/2014/2/26/the-whatsapp-architecture-facebook-bought-for-19-billion.html

Introduction to NoSQL by Martin Fowler

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Red hat linux manuals

manuals

Linux commands

1. Kill a running application by its name:

killall [app_name]

2. Display disk space usage:

df –h

3. Locate the installation directories of a program:

whereis [app]

4. Mount an .iso file:

mount /path/to/file.iso /mnt/cdrom –oloop

5. Record or capture a video of your desktop:

ffmpeg -f x11grab -s wxga -r 25 -i :0.0 -sameq /tmp/out.mpg

6. Find out the Universally Unique Identifier (UUID) of your partitions:

ls /dev/disk/by-uuid/ -alh

7. Show the top ten running processes (sorted by memory usage):

ps aux | sort -nrk 4 | head

8. Make an audible alarm when an IP address goes online:

ping -i 60 -a IP_address

9. Run the last command as root:

sudo !!

10. Make a whole directory tree with one command:

mkdir -p tmp/a/b/c

Linux

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Kernel versus user threads

Introducing the Linux 2.6 kernel

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Free for All

I havent been posting for a while due to hectic workload, both on the personal and professional front. I finally managed to make time for some pastime reading and laid my hands on “Free for all” – (how Linux came to be) by Peter Wayner. It makes for good reading esp. his choice of words. I was pleasantly surprised at how he has simplified highly technical content so that its palatable to both geeks and suits.

I learnt a few things along the way – for instance, whats the difference between licensed under GPL and BSD.

Both of them pertain to open source code but while GPL requires to give back any modification to the source you make to the original project, BSD just requires you to ensure that the copyright notice is present while you build your own version. GNU GPL was started by Richard Stallman, a computer scientist at MIT.